condition mean min max ZT0-3 33.0 33.0 33.0 ZT4-7 24.6 24.6 24.6 ZT8-11 21.900000000000002 21.900000000000002 21.900000000000002 ZT12-15 29.799999999999997 29.799999999999997 29.799999999999997 ZT16-19 4.9 4.9 4.9 ZT20-23 24.5 24.5 24.5